Fresh find at the flea market in Denmark, quite interesting and equipped with something that I think is a kind of "fuse". It's the thin wire connecting the fixing screws. On the upper fastening which, I guess, was used to connect the wire, there are visible markings 60A 500V and the letter D, and a difficult to recognize "sign" under 60A. Interesting and so far un-cataloged insulator. So maybe someone knows something more about this "toddler" ..... Thank you for looking.